Key Details
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Mint & Type: San Francisco “S” mint, Proof strike of the 40% silver half‑dollar series
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Mintage: 2,632,810
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Composition: 40% silver, 60% copper clad layers; weight: 11.50 g; diameter: 30.61 mm; edge: 150‑reed design
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Designers: Obverse by Gilroy Roberts; reverse by Frank Gasparro
Historical Notes
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The 1970 proof sets were among the last 40% silver Kennedy half dollars, as the Mint transitioned to copper-nickel clad in 1971
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Only San Francisco struck these for proof sets—there were no proof coin issues for 1970 from Philadelphia or Denver mints
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